If you trying to build a 100" planes with foamies, i don't think it's a good idea, frames of foamy plane goes unstabilized with the size over 1500CM ( i didn't mean you cann't, but with all supports, it's more heavier than a ply plane)

Files

I have a plan that's almost complete for a 25% Katana - 1942.5mm wingspan. It has NACA 0014 root and 0016 tip wing section.

However, Ive almost completed the build of a 2nd trial Depron model working up to this big one - testing build componets and ideas, hence the pause in finishing the Katana plan.

Its a 59" span Extra 300S. Uses a lightened foam core wing and a 6mm Depron fusalage. AUW 38 oz, 5 sq feet of wing, wing loading 12 oz/sqft. I went for the foam core wing for speed of build, I have a depron skinned built up wing design as well - uses rolled 6mm depron skin over depron formers.

Powered by a Turginy TR 35-48-A 1100kv brushless that gives
81oz thrust from a APC 12x6 off 42 Amps from a 3cell or
13x6.5 giving 91 ozs from 53 Amps.

Should be 3D capable ! Hope to maiden it next weekend as there is still a bit to complete. That plan could be available quite quickly.

thanks guys. This is very good info.
I was eyeing 3D Foamies plans a cpl of weeks ago. I might use them as a 3view.

As for the rigity i am planing to use ordinary white housebuilding foam and Maybe dress it in oracover.
So formers might be 3+cm thick and the skin 1-2cm thick, made up by several layers of 3-5mm foam slices.
If this is not firm enough theres always packing paper that goes on good with diluted woodglue
Not the lightest but UH has big motors too
I choose this because a ARTF would cost about 1200$ here in sweden.
I'll spend the money on United Hobbies instead
Another reason is that i saw this 2.7m foam yak from Mr Claes Meijer.
Look uner videos at http://www7.hemsida.net/meijermodels/indexx.htm

Another thought would be to enlage the Micropitts plans by 760% which would make a span of around 240cm. Thats BIG for a bipe.
/Ulf